Illustration: David Wyffels

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7. Make One Small Change in Bed

Or wherever you and your partner find yourselves when the mood strikes (the kitchen counter, the front entryway...): Wear socks. Researchers have found that warming up the feet leads to warming up other parts of the body. In fact, in a study done at the University of Groningen, in the Netherlands, half the couples were unable to make it to climax, but once socks were offered, the success rate shot up to 80 percent. (Some experts conclude it's harder for us to totally let go when we feel cold.)